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Electrochemical-based purification of electrolyte solutions, and related systems and methods

a technology of electrolyte solution and electrolyte solution, applied in the direction of electrochemical generator, vanadium compound, chemistry apparatus and processes, etc., can solve the problems of consuming many chemicals, affecting battery performance, and neither of these conventional methods adequately remove impurities

Active Publication Date: 2019-06-25
LARGO CLEAN ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These precipitates are detrimental to the electrochemical cell, because they clog the negative electrode and negatively impact battery performance.
Neither of these conventional methods adequately remove impurities that often foul the electrochemical cell of a VRFB.
While many of these methods are effective, they consume many chemicals and the final product commands a high cost premium.

Method used

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  • Electrochemical-based purification of electrolyte solutions, and related systems and methods
  • Electrochemical-based purification of electrolyte solutions, and related systems and methods
  • Electrochemical-based purification of electrolyte solutions, and related systems and methods

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Embodiment Construction

[0037]In some aspects, the present disclosure is directed to methods and systems for removing impurities from an electrolyte solution using a chemical reduction and filtration process. A particularly useful embodiment is described below in the context of a vanadium redox flow battery (VRFB) in which one or more impurities in the vanadium-based electrolyte solution that would in the normal course clog the electrochemical cell of the VRFB during normal use are removed. An oxidation process, such as an electrochemical oxidation process, can be used after filtration to adjust the valence of the reduced electrolyte solution to a desired value, often an electrolyte 3.5 valence.

[0038]In other aspects, the present disclosure is directed to methods and systems directed to and relating to commissioning a redox flow battery (RFB). In a particular embodiment, an electrolyte solution is first reduced to a relatively low oxidation valence and then oxidized to make negative and positive electrolyt...

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Abstract

Methods and systems for removing impurities from electrolyte solutions having three or more valence states. In some embodiments, a method includes electrochemically reducing an electrolyte solution to lower its valence state to a level that causes impurities to precipitate out of the electrolyte solution and then filtering the precipitate(s) out of the electrolyte solution. In embodiments in which the electrolyte solution is desired to be at a valence state higher than the precipitation valence state, a method of the disclosure includes oxidizing the purified electrolyte solution to the target valence.

Description

RELATED APPLICATION DATA[0001]This application claims the benefit of priority of U.S. Provisional Patent Application Ser. No. 62 / 405,576, filed on Oct. 7, 2016, and titled “REDUCTION-BASED PURIFICATION OF ELECTROLYTE SOLUTIONS AND RELATED SYSTEMS AND METHODS”, which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention is related to purification and production of electrolyte solutions. More particularly, the present invention is directed to electrochemical-based purification of electrolyte solutions, and related systems and methods.BACKGROUND[0003]Electrolytes for batteries and other uses generally need to be free of impurities that are detrimental to those uses. For example, in the context of a redox flow battery, each electrolyte used needs to be free of impurities that foul components of the battery. In a particular example, a vanadium redox flow battery (VRFB) is a system that converts electrical energy into chemical energy and the...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01M8/06C01G31/00C01B3/00H01M8/18C01G31/02
CPCH01M8/0693C01G31/00H01M8/188C01G31/02C01B3/00Y02E60/50H01M8/06H01M8/18
Inventor SULLIVAN, JOSEPH T.
Owner LARGO CLEAN ENERGY CORP